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@dalias @kkarhan @signalapp @monocles @lauren

As far as I know, this is turned off by default and even then only visible if people look at the details of a message (which they don't do, realistically). Remember that this only has to happen for a single message to create the link in the contact graph. So if any, this is a red herring, not a mechanism that prevents Signal servers from creating a contact graph, if e.g. forced by the crazy government of the country they are located in.